/* ═══════════════════════════════════════════════════════════ */
/*  E-KATALOG PAGE STYLES                                        */
/* ═══════════════════════════════════════════════════════════ */

/* ── Layout ─────────────────────────────────────────────────── */
.katalog-page {
  /* Site's main aesthetic: dark premium background */
  background: var(--color-brand-darker);
  background-image: radial-gradient(circle at 10% 20%, rgba(59, 114, 200, 0.1) 0%, transparent 50%),
                    radial-gradient(circle at 90% 80%, rgba(20, 61, 141, 0.2) 0%, transparent 50%);
  min-height: calc(100vh - 80px);
  padding-top: 100px; /* Space for fixed header */
  padding-bottom: 40px;
}

.katalog-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  gap: 30px;
  height: calc(100vh - 140px); /* Fill screen minus header/padding */
  min-height: 600px;
}

@media (max-width: 991px) {
  .katalog-container {
    flex-direction: column;
    height: auto;
    min-height: auto;
  }
}

/* ── Sidebar ────────────────────────────────────────────────── */
.katalog-sidebar {
  width: 280px;
  flex-shrink: 0;
  /* Glassmorphism Sidebar */
  background: rgba(13, 38, 85, 0.4);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  padding: 24px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

@media (max-width: 991px) {
  .katalog-sidebar {
    width: 100%;
    flex-direction: row;
    overflow-x: auto;
    padding: 16px;
    background: rgba(13, 38, 85, 0.8);
  }
}

.katalog-sidebar__title {
  font-family: var(--font-primary);
  font-size: 1.5rem;
  color: var(--color-white);
  font-weight: var(--font-weight-bold);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  letter-spacing: 0.5px;
}

@media (max-width: 991px) {
  .katalog-sidebar__title {
    display: none;
  }
}

.katalog-nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

@media (max-width: 991px) {
  .katalog-nav {
    flex-direction: row;
    gap: 12px;
  }
}

.katalog-nav__btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 14px 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid transparent;
  border-radius: 10px;
  font-family: var(--font-primary);
  font-size: 0.95rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-white-80);
  cursor: pointer;
  text-align: left;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (max-width: 991px) {
  .katalog-nav__btn {
    white-space: nowrap;
    border: 1px solid rgba(255, 255, 255, 0.1);
  }
}

.katalog-nav__btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  transform: translateX(4px);
}

@media (max-width: 991px) {
  .katalog-nav__btn:hover {
    transform: translateY(-2px);
  }
}

.katalog-nav__btn.is-active {
  background: var(--color-brand-primary);
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 15px rgba(20, 61, 141, 0.4);
}

.katalog-nav__btn i {
  font-size: 1rem;
  opacity: 0.5;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.katalog-nav__btn.is-active i {
  opacity: 1;
  transform: translateX(4px);
}

@media (max-width: 991px) {
  .katalog-nav__btn i {
    display: none;
  }
}

/* ── Iframe Area ────────────────────────────────────────────── */
.katalog-content {
  flex: 1;
  background: #0D2655;
  border-radius: 16px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

@media (max-width: 991px) {
  .katalog-content {
    height: 70vh;
  }
}

.katalog-iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: #000; /* Dark fallback background */
}

/* Loading Spinner Overlay */
.katalog-loading {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-brand-darker);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.katalog-loading.is-hidden {
  opacity: 0;
  visibility: hidden;
}

.katalog-loading__spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--color-brand-light);
  border-radius: 50%;
  animation: spin 1s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}